<template>
  <view>
    <view class="search-box">
      <!-- 使用 uni-ui 提供的搜索组件 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 搜素结果建议列表 -->
    <view class="sugg-list" v-if="searchResult.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResult" :key="i" @click="gotoGoodsList(item.goods_id)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="forward" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
        <view class="history-box-top">
          <text>搜索历史</text>
          <uni-icons type="trash" size="16" @click="clearHistory"></uni-icons>
        </view>
        <view class="history-list">
          <uni-tag :text="item" v-for="(item, i) in history" :key="i" @click="gotoGoodsList(item)"></uni-tag>
        </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',//存放用户输入的数据
        searchResult:[],//存放搜索结果
        historyList:[]
      };
    },
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      input(e) {
          // e.value 是最新的搜索内容
          // this.kw = ''
          clearTimeout(this.timer)
          this.timer = setTimeout(()=>{
            this.kw = e.value
            this.getSearch()
          },400)
          
        },
       async getSearch(){
          if(this.kw.length === 0){
             this.searchResults = []
            return
          }else{
            const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
            if(res.meta.status !== 200) return uni.$showMsg()
            this.searchResult = res.message
            this.saveSearchHistory()
          }
        },
        saveSearchHistory(){
          const set = new Set(this.historyList)
          set.delete(this.kw)
          set.add(this.kw)
          this.historyList = Array.from(set)
          uni.setStorageSync('kw',JSON.stringify(this.historyList))
        },
        clearHistory(){
          this.historyList = []
          uni.setStorageSync('kw','[]')
        },
        gotoGoodsList(kw){
          uni.navigateTo({
            url:'/subpkg/goods_list/goods_list?query='+kw
          })
        }
      
    },
    computed:{
      history(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}
  
.sugg-list{
   padding: 0 5px;
  .sugg-item{
    font-size: 14px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;
    
    .goods-name{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.history-box{
  .history-box-top{
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 10px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    .uni-tag{
      margin-top: 5px;
      margin-right:10px
    }
  }
}
</style>
